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求教!减小2812捕获中断的响应延迟



2812捕获中断的优先级手动设置为最高,中断程序为将GPIO输出一个脉冲。然后发现从捕获的脉冲发出到开始执行捕获程序有将近500ns的延迟,有没有办法通过软件的手段缩短这个延迟?求各位大神回答!感激不尽!